Question: **What are the possible sources of error while using a theodolite in civil engineering, and how can they be eliminated?** a) Instrument calibration and levelling

**What are the possible sources of error while using a theodolite in civil engineering, and how can they be eliminated?**

a) Instrument calibration and levelling b) Atmospheric refraction and magnetic interference c) Incorrect sighting and instrument alignment d) Temperature variations and instrument weight

Choose the correct option and explain briefly.

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